4:15 PM - 4:30 PM
▲ [17p-F104-10] Single Molecule Rectifying Property of Perpendicularly Connected Porphyrin-Imide with Controlled Molecular Orientation
Keywords:Rectifier, Molecular Electronics, Scanning Tunnel Microscope
In previous research, perpendicularly connected porphyrin-imide molecule was proposed and has been confirmed to possess high single molecular rectification performance. However, the rectifying direction remained unknown because it was unable to control the orientation of molecule 1 (Figure 1) during mechanically controllable break junction measurement due to the symmetrical anchoring groups.
To research the rectifying direction of perpendicularly connected porphyrin-imide, we synthesized the molecule 2 (Figure 1) with thiol group on imide side as anchoring group, and use the porphyrin ring as another anchoring group. These two asymmetrical anchoring groups allow us to coat the molecule on gold substrate with controlled orientation by taking advantage of the strong interaction between thiol and gold. A Molecular Imaging Scanning Tunneling Microscope (STM) was set up with a Nanonis STM Controller and controlled by a home-made LabView controlling program to detect molecular junction without disturbing the orientation of molecules on gold substrate (Figure 2). Therefore, I-V curve of the molecule can be measured with controlled orientation to determine the rectifying direction of 2. In this presentation, the setting up of the STM system will be introduced and the result of I-V measurement of porphyrin-imide molecule will be discussed.
To research the rectifying direction of perpendicularly connected porphyrin-imide, we synthesized the molecule 2 (Figure 1) with thiol group on imide side as anchoring group, and use the porphyrin ring as another anchoring group. These two asymmetrical anchoring groups allow us to coat the molecule on gold substrate with controlled orientation by taking advantage of the strong interaction between thiol and gold. A Molecular Imaging Scanning Tunneling Microscope (STM) was set up with a Nanonis STM Controller and controlled by a home-made LabView controlling program to detect molecular junction without disturbing the orientation of molecules on gold substrate (Figure 2). Therefore, I-V curve of the molecule can be measured with controlled orientation to determine the rectifying direction of 2. In this presentation, the setting up of the STM system will be introduced and the result of I-V measurement of porphyrin-imide molecule will be discussed.